/*
 *  Licensed to the Apache Software Foundation (ASF) under one
 *  or more contributor license agreements.  See the NOTICE file
 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF licenses this file
 *  to you under the Apache License, Version 2.0 (the
 *  "License"); you may not use this file except in compliance
 *  with the License.  You may obtain a copy of the License at
 *
 *    https://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing,
 *  software distributed under the License is distributed on an
 *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 *  KIND, either express or implied.  See the License for the
 *  specific language governing permissions and limitations
 *  under the License.
 */

package org.grails.gorm.graphql.response

import graphql.schema.GraphQLObjectType
import org.grails.gorm.graphql.types.GraphQLTypeManager

/**
 * Generic class to cache the creation of {@link GraphQLObjectType} instances
 * by providing a reference if the object was already created when requested.
 *
 * @author James Kleeh
 * @since 1.0.0
 */
abstract class CachingGraphQLResponseHandler {

    private GraphQLObjectType cachedDefinition

    GraphQLObjectType getDefinition(GraphQLTypeManager typeManager) {
        if (cachedDefinition == null) {
            cachedDefinition = buildDefinition(typeManager)
        }
        cachedDefinition
    }

    abstract protected GraphQLObjectType buildDefinition(GraphQLTypeManager typeManager)
}
